import { Helper } from "../core/helper";

const KD = [
  0x44D7, 0x26BC, 0x626B, 0x135E, 0x5789, 0x35E2, 0x7135, 0x09AF,
  0x4D78, 0x2F13, 0x6BC4, 0x1AF1, 0x5E26, 0x3C4D, 0x789A, 0x47AC,
];
const S0 = [
  0x3e, 0x72, 0x5b, 0x47, 0xca, 0xe0, 0x00, 0x33, 0x04, 0xd1, 0x54, 0x98, 0x09, 0xb9, 0x6d, 0xcb,
  0x7b, 0x1b, 0xf9, 0x32, 0xaf, 0x9d, 0x6a, 0xa5, 0xb8, 0x2d, 0xfc, 0x1d, 0x08, 0x53, 0x03, 0x90,
  0x4d, 0x4e, 0x84, 0x99, 0xe4, 0xce, 0xd9, 0x91, 0xdd, 0xb6, 0x85, 0x48, 0x8b, 0x29, 0x6e, 0xac,
  0xcd, 0xc1, 0xf8, 0x1e, 0x73, 0x43, 0x69, 0xc6, 0xb5, 0xbd, 0xfd, 0x39, 0x63, 0x20, 0xd4, 0x38,
  0x76, 0x7d, 0xb2, 0xa7, 0xcf, 0xed, 0x57, 0xc5, 0xf3, 0x2c, 0xbb, 0x14, 0x21, 0x06, 0x55, 0x9b,
  0xe3, 0xef, 0x5e, 0x31, 0x4f, 0x7f, 0x5a, 0xa4, 0x0d, 0x82, 0x51, 0x49, 0x5f, 0xba, 0x58, 0x1c,
  0x4a, 0x16, 0xd5, 0x17, 0xa8, 0x92, 0x24, 0x1f, 0x8c, 0xff, 0xd8, 0xae, 0x2e, 0x01, 0xd3, 0xad,
  0x3b, 0x4b, 0xda, 0x46, 0xeb, 0xc9, 0xde, 0x9a, 0x8f, 0x87, 0xd7, 0x3a, 0x80, 0x6f, 0x2f, 0xc8,
  0xb1, 0xb4, 0x37, 0xf7, 0x0a, 0x22, 0x13, 0x28, 0x7c, 0xcc, 0x3c, 0x89, 0xc7, 0xc3, 0x96, 0x56,
  0x07, 0xbf, 0x7e, 0xf0, 0x0b, 0x2b, 0x97, 0x52, 0x35, 0x41, 0x79, 0x61, 0xa6, 0x4c, 0x10, 0xfe,
  0xbc, 0x26, 0x95, 0x88, 0x8a, 0xb0, 0xa3, 0xfb, 0xc0, 0x18, 0x94, 0xf2, 0xe1, 0xe5, 0xe9, 0x5d,
  0xd0, 0xdc, 0x11, 0x66, 0x64, 0x5c, 0xec, 0x59, 0x42, 0x75, 0x12, 0xf5, 0x74, 0x9c, 0xaa, 0x23,
  0x0e, 0x86, 0xab, 0xbe, 0x2a, 0x02, 0xe7, 0x67, 0xe6, 0x44, 0xa2, 0x6c, 0xc2, 0x93, 0x9f, 0xf1,
  0xf6, 0xfa, 0x36, 0xd2, 0x50, 0x68, 0x9e, 0x62, 0x71, 0x15, 0x3d, 0xd6, 0x40, 0xc4, 0xe2, 0x0f,
  0x8e, 0x83, 0x77, 0x6b, 0x25, 0x05, 0x3f, 0x0c, 0x30, 0xea, 0x70, 0xb7, 0xa1, 0xe8, 0xa9, 0x65,
  0x8d, 0x27, 0x1a, 0xdb, 0x81, 0xb3, 0xa0, 0xf4, 0x45, 0x7a, 0x19, 0xdf, 0xee, 0x78, 0x34, 0x60,
];
const S1 = [
  0x55, 0xc2, 0x63, 0x71, 0x3b, 0xc8, 0x47, 0x86, 0x9f, 0x3c, 0xda, 0x5b, 0x29, 0xaa, 0xfd, 0x77,
  0x8c, 0xc5, 0x94, 0x0c, 0xa6, 0x1a, 0x13, 0x00, 0xe3, 0xa8, 0x16, 0x72, 0x40, 0xf9, 0xf8, 0x42,
  0x44, 0x26, 0x68, 0x96, 0x81, 0xd9, 0x45, 0x3e, 0x10, 0x76, 0xc6, 0xa7, 0x8b, 0x39, 0x43, 0xe1,
  0x3a, 0xb5, 0x56, 0x2a, 0xc0, 0x6d, 0xb3, 0x05, 0x22, 0x66, 0xbf, 0xdc, 0x0b, 0xfa, 0x62, 0x48,
  0xdd, 0x20, 0x11, 0x06, 0x36, 0xc9, 0xc1, 0xcf, 0xf6, 0x27, 0x52, 0xbb, 0x69, 0xf5, 0xd4, 0x87,
  0x7f, 0x84, 0x4c, 0xd2, 0x9c, 0x57, 0xa4, 0xbc, 0x4f, 0x9a, 0xdf, 0xfe, 0xd6, 0x8d, 0x7a, 0xeb,
  0x2b, 0x53, 0xd8, 0x5c, 0xa1, 0x14, 0x17, 0xfb, 0x23, 0xd5, 0x7d, 0x30, 0x67, 0x73, 0x08, 0x09,
  0xee, 0xb7, 0x70, 0x3f, 0x61, 0xb2, 0x19, 0x8e, 0x4e, 0xe5, 0x4b, 0x93, 0x8f, 0x5d, 0xdb, 0xa9,
  0xad, 0xf1, 0xae, 0x2e, 0xcb, 0x0d, 0xfc, 0xf4, 0x2d, 0x46, 0x6e, 0x1d, 0x97, 0xe8, 0xd1, 0xe9,
  0x4d, 0x37, 0xa5, 0x75, 0x5e, 0x83, 0x9e, 0xab, 0x82, 0x9d, 0xb9, 0x1c, 0xe0, 0xcd, 0x49, 0x89,
  0x01, 0xb6, 0xbd, 0x58, 0x24, 0xa2, 0x5f, 0x38, 0x78, 0x99, 0x15, 0x90, 0x50, 0xb8, 0x95, 0xe4,
  0xd0, 0x91, 0xc7, 0xce, 0xed, 0x0f, 0xb4, 0x6f, 0xa0, 0xcc, 0xf0, 0x02, 0x4a, 0x79, 0xc3, 0xde,
  0xa3, 0xef, 0xea, 0x51, 0xe6, 0x6b, 0x18, 0xec, 0x1b, 0x2c, 0x80, 0xf7, 0x74, 0xe7, 0xff, 0x21,
  0x5a, 0x6a, 0x54, 0x1e, 0x41, 0x31, 0x92, 0x35, 0xc4, 0x33, 0x07, 0x0a, 0xba, 0x7e, 0x0e, 0x34,
  0x88, 0xb1, 0x98, 0x7c, 0xf3, 0x3d, 0x60, 0x6c, 0x7b, 0xca, 0xd3, 0x1f, 0x32, 0x65, 0x04, 0x28,
  0x64, 0xbe, 0x85, 0x9b, 0x2f, 0x59, 0x8a, 0xd7, 0xb0, 0x25, 0xac, 0xaf, 0x12, 0x03, 0xe2, 0xf2,
];
const EK_d = [
  0x44D7, 0x26BC, 0x626B, 0x135E, 0x5789, 0x35E2, 0x7135, 0x09AF,
  0x4D78, 0x2F13, 0x6BC4, 0x1AF1, 0x5E26, 0x3C4D, 0x789A, 0x47AC
];
class ZUC_CTX {
  public F_R1: number;
  public F_R2: number;
  public LFSR_S: number[];
  public BRC_X: number[];

  public constructor() {
    this.F_R1 = 0;
    this.F_R2 = 0;
    this.LFSR_S = new Array(16);
    this.BRC_X = new Array(4);
  }
}

export class ZUC {
  public constructor() {
    this.ctx = new ZUC_CTX();
    this.now_val = 0;
    this.ix = 0;
  }
  public static AddM(a: number, b: number): number {
    a += b;
    a = (a & 0x7FFFFFFF) + (a >>> 31);
    return a;
  }
  public static ROT31(x: number, k: number): number {
    return ((((x) << k) | (x >>> (31 - k))) & 0x7FFFFFFF);
  }
  public static LFSRWithInitializationMode(u: number, ctx: ZUC_CTX) {
    let f;
    f = ctx.LFSR_S[0];
    f = ZUC.AddM(f, ZUC.ROT31(ctx.LFSR_S[0], 8));
    f = ZUC.AddM(f, ZUC.ROT31(ctx.LFSR_S[4], 20));
    f = ZUC.AddM(f, ZUC.ROT31(ctx.LFSR_S[10], 21));
    f = ZUC.AddM(f, ZUC.ROT31(ctx.LFSR_S[13], 17));
    f = ZUC.AddM(f, ZUC.ROT31(ctx.LFSR_S[15], 15));
    f = ZUC.AddM(f, u);

    for (let i = 0; i < 15; ++i) ctx.LFSR_S[i] = ctx.LFSR_S[i + 1];
    ctx.LFSR_S[15] = f;
  }
  public static LFSRWithWorkMode(ctx: ZUC_CTX) {

    let f: bigint = BigInt(ctx.LFSR_S[0]);
    f += BigInt(ctx.LFSR_S[0]) << BigInt(8);
    f += BigInt(ctx.LFSR_S[4]) << BigInt(20);
    f += BigInt(ctx.LFSR_S[10]) << BigInt(21);
    f += BigInt(ctx.LFSR_S[13]) << BigInt(17);
    f += BigInt(ctx.LFSR_S[15]) << BigInt(15);
    f = (f & BigInt(0x7fffffff)) + (f >> BigInt(31));
    f = (f & BigInt(0x7fffffff)) + (f >> BigInt(31));

    /* 更新 LSFR 生成序列 */
    for (let i = 0; i < 15; ++i) ctx.LFSR_S[i] = ctx.LFSR_S[i + 1];
    ctx.LFSR_S[15] = Helper.uint(Number(f));
  }
  public static BitReorganization2(ctx: ZUC_CTX) {
    ctx.BRC_X[1] = Helper.uint((ctx.LFSR_S[11] & 0xFFFF) << 16) | (ctx.LFSR_S[9] >>> 15);
    ctx.BRC_X[2] = Helper.uint((ctx.LFSR_S[7] & 0xFFFF) << 16) | (ctx.LFSR_S[5] >>> 15);
  }
  public static BitReorganization3(ctx: ZUC_CTX) {
    ctx.BRC_X[0] = Helper.uint((ctx.LFSR_S[15] & 0x7FFF8000) << 1) | (ctx.LFSR_S[14] & 0xFFFF);
    ZUC.BitReorganization2(ctx);
  }
  public static BitReorganization4(ctx: ZUC_CTX) {
    ZUC.BitReorganization3(ctx);
    ctx.BRC_X[3] = Helper.uint((ctx.LFSR_S[2] & 0xFFFF) << 16) | (ctx.LFSR_S[0] >>> 15);
  }
  public static ROT(a: number, k: number): number {
    return ((a) << k) | ((a) >>> (32 - k));
  }
  public static L1(X: number): number {
    return Helper.uint(X ^ ZUC.ROT(X, 2) ^ ZUC.ROT(X, 10) ^ ZUC.ROT(X, 18) ^ ZUC.ROT(X, 24));
  }
  public static L2(X: number): number {
    return Helper.uint(X ^ ZUC.ROT(X, 8) ^ ZUC.ROT(X, 14) ^ ZUC.ROT(X, 22) ^ ZUC.ROT(X, 30));
  }
  public static MAKEU32(a: number, b: number, c: number, d: number): number {
    return Helper.uint((a << 24) | (b << 16) | (c << 8) | (d));
  }
  public static F(ctx: ZUC_CTX): number {
    let W = (ctx.BRC_X[0] ^ ctx.F_R1) + ctx.F_R2;
    ZUC._F(ctx);
    return W;
  }
  public static _F(ctx: ZUC_CTX) {
    let W1, W2, u, v;

    W1 = ctx.F_R1 + ctx.BRC_X[1];
    W2 = ctx.F_R2 ^ ctx.BRC_X[2];
    u = ZUC.L1(((W1 << 16) | (W2 >>> 16)));
    v = ZUC.L2(((W2 << 16) | (W1 >>> 16)));
    ctx.F_R1 = ZUC.MAKEU32(S0[(u >>> 24)], S1[((u >>> 16) & 0xFF)], S0[((u >>> 8) & 0xFF)], S1[((u >>> 0) & 0xFF)]);
    ctx.F_R2 = ZUC.MAKEU32(S0[(v >>> 24)], S1[((v >>> 16) & 0xFF)], S0[((v >>> 8) & 0xFF)], S1[((v >>> 0) & 0xFF)]);
  }
  public static MAKEU31(k: number, d: number, iv: number): number {
    return Helper.uint(k << 23 | d << 8 | iv);
  }
  public static Initialization(k: number[], iv: number[], ctx: ZUC_CTX) {
    ctx.F_R1 = 0;
    ctx.F_R2 = 0;
    for (let i = 0; i < 16; ++i) ctx.LFSR_S[i] = ZUC.MAKEU31(k[i], EK_d[i], iv[i]);

    let nCount = 32;
    let w;
    while (nCount > 0) {
      ZUC.BitReorganization3(ctx);
      w = ZUC.F(ctx);
      ZUC.LFSRWithInitializationMode(w >>> 1, ctx);
      nCount--;
    }

    ZUC.BitReorganization2(ctx);
    ZUC._F(ctx);
    ZUC.LFSRWithWorkMode(ctx);
  }
  public static GenerateKeyStream(pKeyStream: number[], KeyStreamLen: number, ctx: ZUC_CTX) {
    /* working cycles */
    for (let i = 0; i < KeyStreamLen; ++i) {
      ZUC.BitReorganization4(ctx);
      pKeyStream[i] = ctx.BRC_X[3] ^ ((ctx.BRC_X[0] ^ ctx.F_R1) + ctx.F_R2);
      ZUC._F(ctx);
      ZUC.LFSRWithWorkMode(ctx);
    }
  }
  public static Next(val: number, ctx: ZUC_CTX): number {
    ZUC.BitReorganization4(ctx);
    val = ctx.BRC_X[3] ^ ((ctx.BRC_X[0] ^ ctx.F_R1) + ctx.F_R2);

    ZUC._F(ctx);
    ZUC.LFSRWithWorkMode(ctx);
    return val;
  }
  public static Next2(ctx: ZUC_CTX) {
    ZUC.BitReorganization4(ctx);
    ZUC._F(ctx);
    ZUC.LFSRWithWorkMode(ctx);
  }
  public ctx: ZUC_CTX;
  public now_val: number;
  public ix: number;
  public Init(iv: number[], key: number[]) {
    this.ix = 0;
    ZUC.Initialization(key, iv, this.ctx);
  }
  public Jump(times: number) {
    for (; times > 0; --times, ++this.ix) ZUC.Next2(this.ctx);
  }
  public Next(): number {
    this.now_val = ZUC.Next(this.now_val, this.ctx);
    this.ix++;
    return this.now_val;
  }
  public Now() {
    return this.now_val;
  }
  public get NowPos(): number {
    return this.ix;
  }
  public NextHex(): string {
    this.Next();
    return this.NowHex();
  }
  public NowHex(): string {
    return Helper.ToHex(Helper.uint2byte(this.now_val));
  }
}